EP0451694A2 - Time-multiplex transmission system - Google Patents

Time-multiplex transmission system Download PDF

Info

Publication number
EP0451694A2
EP0451694A2 EP19910105300 EP91105300A EP0451694A2 EP 0451694 A2 EP0451694 A2 EP 0451694A2 EP 19910105300 EP19910105300 EP 19910105300 EP 91105300 A EP91105300 A EP 91105300A EP 0451694 A2 EP0451694 A2 EP 0451694A2
Authority
EP
European Patent Office
Prior art keywords
time
base station
mobile station
transmission system
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910105300
Other languages
German (de)
French (fr)
Other versions
EP0451694A3 (en
Inventor
Günter Dr. Höfgen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
Alcatel Lucent NV
Original Assignee
Alcatel SEL AG
Alcatel NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel SEL AG, Alcatel NV filed Critical Alcatel SEL AG
Publication of EP0451694A2 publication Critical patent/EP0451694A2/en
Publication of EP0451694A3 publication Critical patent/EP0451694A3/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging

Definitions

  • the invention relates to a time-division multiplex transmission system according to the preamble of claim 1.
  • a system is known from DE-OS 34 23 640.
  • GSM Global System for Mobile Communications
  • a digital cellular mobile phone system (described in: Conference Proceedings, Digital Cellular Radio Conference, Hagen, October 1988), which is to be installed across Europe from 1991, a distinction is made between the first access of a mobile station to a base station with shortened signals (access bursts) and the timed communication on time slots, which, apart from a very short protection time, are fully used for signal transmission (normal bursts).
  • the first access takes place when a mobile station wants to establish a connection to this base station after it has synchronized itself to the time frame of a base station.
  • the radio signal used for this (access burst) is dimensioned so short that a protection time of 0.25 ms remains in the time slot, so that access can be made from distances up to approximately 37 km away. At this maximum distance, the double signal transit time is equal to the protection time.
  • the base station measures the signal transit time and sends a message to the mobile station to advance the time frame by the value of the signal transit time, so that the time slots can be fully used during the subsequent time-based communication.
  • the GSM system is not designed for operation from longer distances because the effort would increase and the degree of utilization would decrease due to long protection times.
  • the transmission system according to the invention has the advantage that it can be implemented very inexpensively if the stationary part of the system (base stations, switching devices, etc.) is largely identical, for example, to that known from the GSM system or another TDMA system, and also that Mobile stations are largely identical in construction to those usual in the GSM system, but are expanded by means of distance determination. This extension can be achieved, for example, by coupling with a standard navigation device.
  • the new transmission system is therefore particularly suitable as an aircraft telephone system, since aircraft are anyway equipped with navigation systems that can be used according to the invention.
  • the only figure shows the relative temporal position of the time slots in the mobile and base station.
  • the new time division multiplex transmission system consists of at least one base station and one mobile station, which communicate with one another in time division multiplex.
  • Each base station specifies a time frame that has several time slots that are separated from one another by guard times S.
  • the protection times prevent a temporal overlap of the transmissions of different mobile stations, which communicate with the base station in adjacent time slots, caused by different signal propagation times at the base station location.
  • each base station periodically sends an individual identifier that enables it to be identified, or clear or encrypted information about its geographical location.
  • the mobile station receives the signal of at least one base station, synchronizes itself with the received time frame and determines the exact geographical location of the base station.
  • the mobile station has a memory in which the locations and identifications of all base stations belonging to the transmission system are stored, or an evaluation circuit for the clear or encrypted information sent by the base station.
  • the mobile station has means for determining its own geographic location and for Calculation of the distance to the base station.
  • the mobile station has, for example, a GPS (Global Positioning System) receiver or other suitable navigation means. Since the signal transit time is proportional to the distance, the mobile station determines from the distance the time offset by which it must advance the start of its transmission so that its transmission arrives at the base station in the correct time frame with respect to the time frame of the base station.
  • GPS Global Positioning System
  • the time frame of the mobile station is shifted by a certain amount compared to the time frame of the base station. This is shown under b).
  • the size of the shift is generally variable over time, according to the movement of the mobile station and changing propagation conditions of the radio signals.
  • the fixed stations additionally have devices for the exact determination of the time position of the mobile station sent signals with respect to the time frame of the base station and send, as described in DE-OS 34 23 640, a control signal for fine adjustment of the transmission time of the mobile station, which then shifts its transmission time accordingly.

Abstract

A time-division multiplex transmission system is described which has base stations (FS) and mobile stations (MS). The mobile stations (MS) contain means for determining their respective location and the distance from the base station (FS). The mobile stations shift their transmitting time as a function of the distance in such a manner that the signals sent by them arrive at the base station (FS) at the correct time with respect to the time scale of the base station (FS). <IMAGE>

Description

Die Erfindung bezieht sich auf ein Zeitmultiplex-Übertragungssystem gemäß dem Oberbegriff des Anspruchs 1. Ein derartiges System ist aus der DE-OS 34 23 640 bekannt.The invention relates to a time-division multiplex transmission system according to the preamble of claim 1. Such a system is known from DE-OS 34 23 640.

Beim sogenannten GSM-System, einem digitalen zellularen Mobiltelefonsystem (beschrieben in: Conference Proceedings, Digital Cellular Radio Conference, Hagen, Okt. 1988), das europaweit ab 1991 installiert werden soll, wird unterschieden zwischen dem Erstzugriff einer Mobilstation zu einer Feststation mit verkürzten Signalen (access bursts) und der zeitgeordneten Kommunikation auf Zeitschlitzen, die, von einer sehr kurzen Schutzzeit abgesehen, voll für die Signalübertragung genutzt werden (normal bursts). Der Erstzugriff erfolgt, wenn eine Mobilstation, nachdem sie sich auf den Zeitrahmen einer Feststation synchronisiert hat, eine Verbindung zu dieser Feststation aufbauen will. Das hierfür benützte Funksignal (access burst) ist so kurz bemessen, daß im Zeitschlitz noch eine Schutzzeit von 0,25 ms übrigbleibt, sodaß der Zugriff aus Entfernungen bis zu etwa 37 km Entfernung erfolgen kann. Bei dieser Maximalentfernung ist die doppelte Signallaufzeit gleich der Schutzzeit.In the so-called GSM system, a digital cellular mobile phone system (described in: Conference Proceedings, Digital Cellular Radio Conference, Hagen, October 1988), which is to be installed across Europe from 1991, a distinction is made between the first access of a mobile station to a base station with shortened signals (access bursts) and the timed communication on time slots, which, apart from a very short protection time, are fully used for signal transmission (normal bursts). The first access takes place when a mobile station wants to establish a connection to this base station after it has synchronized itself to the time frame of a base station. The radio signal used for this (access burst) is dimensioned so short that a protection time of 0.25 ms remains in the time slot, so that access can be made from distances up to approximately 37 km away. At this maximum distance, the double signal transit time is equal to the protection time.

Die Feststation mißt die Signallaufzeit und sendet zur Mobilstation eine Nachricht, den Zeitrahmen um den Wert der Signallaufzeit vorzuverlegen, so daß während der anschließenden zeitgeordneten Kommunikation die Zeitschlitze voll genutzt werden können.The base station measures the signal transit time and sends a message to the mobile station to advance the time frame by the value of the signal transit time, so that the time slots can be fully used during the subsequent time-based communication.

Für den Betrieb aus größeren Entfernungen ist das GSM-System nicht ausgelegt, weil der Aufwand steigen und der Ausnutzungsgrad wegen langer Schutzzeiten sinken würde.The GSM system is not designed for operation from longer distances because the effort would increase and the degree of utilization would decrease due to long protection times.

Es ist Aufgabe der vorliegenden Erfindung, ein Zeitmultiplex-Übertragungssystem anzugeben, bei dem erheblich größere Signallaufzeiten zugelassen werden können, ohne deshalb die Schutzzeiten verlängern zu müssen.It is an object of the present invention to provide a time-division multiplex transmission system in which considerably longer signal propagation times can be permitted without the protection times therefore having to be extended.

Die Lösung dieser Aufgabe erfolgt durch die im Anspruch 1 genannten Mittel. In den Unteransprüchen werden Weiterbildungen des Übertragungssystems beansprucht.This object is achieved by the means mentioned in claim 1. Further developments of the transmission system are claimed in the subclaims.

Das erfindungsgemäße Übertragungssystem hat den Vorteil, daß es sehr kostengünstig realisiert werden kann, wenn der ortsfeste Teil des Systems (Feststationen, Vermittlungseinrichtungen, usw.) beispielsweise mit dem vom GSM-System oder einem anderen TDMA-System bekannten weitgehend identisch ist, und auch die Mobilstationen weitgehend mit den beim GSM-System üblichen baugleich, jedoch um Mittel zur Entfernungsbestimmung erweitert sind. Diese Erweiterung kann beispielsweise durch Kopplung mit einem handelsüblichen Navigationsgerät erreicht werden. Das neue übertragungssystem ist daher insbesondere als Flugzeugtelefonsystem geeignet, da Flugzeuge ja sowieso mit Navigationssystemen ausgerüstet sind, die erfindungsgemäß mitbenutzt werden können.The transmission system according to the invention has the advantage that it can be implemented very inexpensively if the stationary part of the system (base stations, switching devices, etc.) is largely identical, for example, to that known from the GSM system or another TDMA system, and also that Mobile stations are largely identical in construction to those usual in the GSM system, but are expanded by means of distance determination. This extension can be achieved, for example, by coupling with a standard navigation device. The new transmission system is therefore particularly suitable as an aircraft telephone system, since aircraft are anyway equipped with navigation systems that can be used according to the invention.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispiels erläutert.The invention is explained below using an exemplary embodiment.

Die einzige Figur zeigt die relative zeitliche Lage der Zeitschlitze in der Mobil- und Feststation.The only figure shows the relative temporal position of the time slots in the mobile and base station.

Das neue Zeitmultiplex-Übertragungssystem besteht aus mindestens einer Feststation und einer Mobilstation, die im Zeitmultiplex miteinander kommunizieren. Dabei gibt jede Feststation einen Zeitrahmen vor, der mehrere Zeitschlitze aufweist, die durch Schutzzeiten S voneinander getrennt sind. Die Schutzzeiten verhindern eine durch unterschiedliche Signallaufzzeiten hervorgerufene zeitliche Überlappung der Sendungen verschiedener Mobilstationen, die in benachbarten Zeitschlitzen mit der Feststation kommunizieren, am Ort der Feststation. Innerhalb dieses Zeitrahmens sendet jede Feststation periodisch eine individuelle Kennung, die ihre Identifizierung ermöglicht, oder klare oder verschlüsselte Angaben über ihren geographischen Standort.The new time division multiplex transmission system consists of at least one base station and one mobile station, which communicate with one another in time division multiplex. Each base station specifies a time frame that has several time slots that are separated from one another by guard times S. The protection times prevent a temporal overlap of the transmissions of different mobile stations, which communicate with the base station in adjacent time slots, caused by different signal propagation times at the base station location. Within this time frame, each base station periodically sends an individual identifier that enables it to be identified, or clear or encrypted information about its geographical location.

Die Mobilstation empfängt das Signal zumindest einer Feststation, synchronisiert sich auf den empfangenen Zeitrahmen und ermittelt den genauen geographischen Standort der Feststation. Dazu besitzt die Mobilstation einen Speicher, in dem die Standorte und Kennungen aller zu dem Übertragungssystem gehörenden Feststationen gespeichert sind, oder eine Auswerteschaltung für die von der Feststation gesendeten klaren oder verschlüsselten Angaben.The mobile station receives the signal of at least one base station, synchronizes itself with the received time frame and determines the exact geographical location of the base station. For this purpose, the mobile station has a memory in which the locations and identifications of all base stations belonging to the transmission system are stored, or an evaluation circuit for the clear or encrypted information sent by the base station.

Ferner besitzt die Mobilstation Mittel zur Bestimmung ihres jeweiligen eigenen geographischen Standorts und zur Berechnung der Entfernung zur Feststation. Dazu besitzt die Mobilstation beispielsweise einen GPS (Global Positioning System)-Empfänger oder andere geeignete Navigationsmittel. Da die Signallaufzeit proportional zur Entfernung ist, ermittelt die Mobilstation aus der Entfernung den Zeitversatz, um den sie den Beginn ihrer Sendung vorverlegen muß, damit ihre Sendung in zeitlich richtiger Lage bezüglich des Zeitrahmens der Feststation bei dieser eintrifft.Furthermore, the mobile station has means for determining its own geographic location and for Calculation of the distance to the base station. For this purpose, the mobile station has, for example, a GPS (Global Positioning System) receiver or other suitable navigation means. Since the signal transit time is proportional to the distance, the mobile station determines from the distance the time offset by which it must advance the start of its transmission so that its transmission arrives at the base station in the correct time frame with respect to the time frame of the base station.

Dieser Sachverhalt ist durch die einzige Figur schematisch dargestellt, die unter a) und d) einen Ausschnitt aus dem Zeitrahmen der Feststation zeigt. Es sind dort schraffiert die Zeitschlitze und nicht schraffiert die Schutzzeiten S dargestellt.This situation is shown schematically by the only figure, which shows a section of the time frame of the base station under a) and d). The time slots are shown hatched and the protection times S are not hatched.

Aufgrund der Signallaufzeit ist der Zeitrahmen der Mobilstation um einen bestimmten Betrag gegenüber dem Zeitrahmen der Feststation verschoben. Dies ist unter b) dargestellt. Die Größe der Verschiebung ist im allgemeinen zeitlich veränderlich, entsprechend der Bewegung der Mobilstation und sich ändernder Ausbreitungsbedingungen der Funksignale.Due to the signal delay, the time frame of the mobile station is shifted by a certain amount compared to the time frame of the base station. This is shown under b). The size of the shift is generally variable over time, according to the movement of the mobile station and changing propagation conditions of the radio signals.

Unter c) ist dargestellt, daß die Mobilstation zu einem früheren Zeitpunkt als durch ihren unter b) dargestellten Zeitrahmen bedingt mit dem Senden beginnt, so daß die gesendeten Signale hinreichend synchron mit dem Zeitrahmen der Feststation bei dieser ankommen.Under c) it is shown that the mobile station begins transmitting earlier than the time frame shown in b), so that the transmitted signals arrive at the base station in sufficient synchronization with the time frame.

Bei einer anderen Ausführung des Zeitmultiplex-Übertragungssystems besitzen die Feststationen zusätzlich Einrichtungen zur genauen Bestimmung der zeitlichen Lage des von der Mobilstation gesendeten Signals bezüglich des Zeitrahmens der Feststation und senden, wie in der DE-OS 34 23 640 beschrieben, ein Steuersignal zur Feineinstellung des Sendezeitpunktes der Mobilstation, die daraufhin ihren Sendezeitpunkt entsprechend verschiebt.In another embodiment of the time-division multiplex transmission system, the fixed stations additionally have devices for the exact determination of the time position of the mobile station sent signals with respect to the time frame of the base station and send, as described in DE-OS 34 23 640, a control signal for fine adjustment of the transmission time of the mobile station, which then shifts its transmission time accordingly.

Claims (3)

Zeitmultiplex-Übertragungssystem mit mindestens einer Mobilstation und mindestens einer Feststation, die einen Zeitrahmen vorgibt, der mehrere durch Schutzzeiten voneinander getrennte Zeitschlitze enthält, wobei die Mobilstation ihren Sendezeitrahmen abhängig von der Entfernung zur Feststation so einstellt, daß von ihr gesendete Informationen in zeitlich richtiger Lage bezüglich des Zeitrahmens der Feststation bei dieser eintreffen, dadurch gekennzeichnet, daß die Mobilstation (MS) Mittel zur Bestimmung der Entfernung zur Feststation (FS) enthält.Time-division multiplex transmission system with at least one mobile station and at least one base station, which specifies a time frame which contains a plurality of time slots separated by guard times, the mobile station setting its transmission time frame depending on the distance to the base station in such a way that information transmitted by it is in the correct position in time of the time frame of the base station arrive at it, characterized in that the mobile station (MS) contains means for determining the distance to the base station (FS). Zeitmultiplex-Übertragungssystem nach Anspruch 1, dadurch gekennzeichnet, daß die Mobilstation (MS) Navigationsmittel zur Bestimmung des eigenen Standorts enthält, daß jede Feststation (FS) eine individuelle Kennung oder andere Angaben über ihren Standort sendet und daß daraus die Mobilstation (MS) die Entfernung zur Feststation (FS) berechnet.Time-division multiplex transmission system according to claim 1, characterized in that the mobile station (MS) contains navigation means for determining its own location, that each base station (FS) sends an individual identifier or other information about its location and that the mobile station (MS) uses it to determine the distance to the base station (FS) calculated. Zeitmultiplex-Übertragungssystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Feststation zusätzlich Einrichtungen zur genauen Bestimmung der zeitliche Lage des von der Mobilstation gesendeten Signals bezüglich des Zeitrahmens der Feststation enthält und ein Steuersignal zur Feineinstellung des Sendezeitpunktes der Mobilstation sendet und daß die Mobilstation Einrichtungen zur Auswertung des Steuersignals enthält und ihren Sendezeitpunkt entsprechend verschiebt.Time-division multiplex transmission system according to claim 1 or 2, characterized in that the base station additionally means for precise determination of the timing of the signal transmitted by the mobile station with respect to the Contains time frame of the base station and sends a control signal for fine adjustment of the transmission time of the mobile station and that the mobile station contains devices for evaluating the control signal and shifts its transmission time accordingly.
EP19910105300 1990-04-07 1991-04-04 Time-multiplex transmission system Withdrawn EP0451694A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4011341 1990-04-07
DE19904011341 DE4011341A1 (en) 1990-04-07 1990-04-07 TIME MULTIPLEX TRANSMISSION SYSTEM

Publications (2)

Publication Number Publication Date
EP0451694A2 true EP0451694A2 (en) 1991-10-16
EP0451694A3 EP0451694A3 (en) 1992-07-08

Family

ID=6403996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910105300 Withdrawn EP0451694A3 (en) 1990-04-07 1991-04-04 Time-multiplex transmission system

Country Status (2)

Country Link
EP (1) EP0451694A3 (en)
DE (1) DE4011341A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0564429A2 (en) * 1992-03-30 1993-10-06 Telefonaktiebolaget Lm Ericsson Cell extension in a cellular telephone system
WO1994026074A1 (en) * 1993-04-26 1994-11-10 Airtouch Communications Cdma transmission delay method and apparatus
US5479397A (en) * 1991-04-02 1995-12-26 Airtouch Communications Of California CDMA transmission delay method and apparatus
WO1996017452A1 (en) * 1994-11-30 1996-06-06 Alcatel N.V. Burst alignment procedure
FR2755331A1 (en) * 1996-10-29 1998-04-30 Ertp Etudes Et Realisations Te Data transmission system for mobile radio networks
EP0928077A2 (en) * 1997-12-30 1999-07-07 Alcatel Method for increasing the range of a radiocommunications unit and unit for carrying out the method
ES2158779A1 (en) * 1999-04-29 2001-09-01 Cerabrick Grupo Ceramico S A External and internal building construction ceramic consists of a ground clay and cardboard industry pulp paste residue mixture with or without sand and silica
FR2870414A1 (en) * 2004-05-17 2005-11-18 Alcatel Sa DETERMINATION BY A COMMUNICATION TERMINAL OF THE TIME OF PROPAGATION OF A REFERENCE SIGNAL FROM A COMMUNICATIONS MANAGEMENT EQUIPMENT

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19534156C1 (en) * 1995-09-14 1996-10-17 Siemens Ag Time multiplex data packet transmission method
DE19741681A1 (en) * 1997-09-22 1999-03-25 Cit Alcatel Base station e.g. for Cordless Telephone System

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171525A2 (en) * 1984-06-27 1986-02-19 Alcatel SEL Aktiengesellschaft Mobile radio system
EP0199266A1 (en) * 1985-04-17 1986-10-29 Siemens Aktiengesellschaft Mobile radio system
EP0341738A2 (en) * 1988-05-13 1989-11-15 AEG MOBILE COMMUNICATION GmbH Apparatus for own position-fixing, especially for vehicles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171525A2 (en) * 1984-06-27 1986-02-19 Alcatel SEL Aktiengesellschaft Mobile radio system
EP0199266A1 (en) * 1985-04-17 1986-10-29 Siemens Aktiengesellschaft Mobile radio system
EP0341738A2 (en) * 1988-05-13 1989-11-15 AEG MOBILE COMMUNICATION GmbH Apparatus for own position-fixing, especially for vehicles

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5479397A (en) * 1991-04-02 1995-12-26 Airtouch Communications Of California CDMA transmission delay method and apparatus
US5504936A (en) * 1991-04-02 1996-04-02 Airtouch Communications Of California Microcells for digital cellular telephone systems
US5678186A (en) * 1991-04-02 1997-10-14 Airtouch Communications, Inc. Digital microcells for cellular networks
US6434406B2 (en) 1991-04-02 2002-08-13 Cellco Partnership Antenna system for a cellular telephone network
US5983118A (en) * 1991-04-02 1999-11-09 Airtouch Communications, Inc. Antenna system for a cellular telephone network
US6101177A (en) * 1992-03-30 2000-08-08 Telefonaktiebolaget Lm Ericsson Cell extension in a cellular telephone system
EP0564429A3 (en) * 1992-03-30 1994-05-18 Ericsson Telefon Ab L M Cell extension in a cellular telephone system
AU662046B2 (en) * 1992-03-30 1995-08-17 Telefonaktiebolaget Lm Ericsson (Publ) Cell extension in a cellular telephone system
EP0564429A2 (en) * 1992-03-30 1993-10-06 Telefonaktiebolaget Lm Ericsson Cell extension in a cellular telephone system
WO1994026074A1 (en) * 1993-04-26 1994-11-10 Airtouch Communications Cdma transmission delay method and apparatus
WO1996017452A1 (en) * 1994-11-30 1996-06-06 Alcatel N.V. Burst alignment procedure
FR2755331A1 (en) * 1996-10-29 1998-04-30 Ertp Etudes Et Realisations Te Data transmission system for mobile radio networks
EP0928077A2 (en) * 1997-12-30 1999-07-07 Alcatel Method for increasing the range of a radiocommunications unit and unit for carrying out the method
EP0928077A3 (en) * 1997-12-30 2003-07-30 Alcatel Method for increasing the range of a radiocommunications unit and unit for carrying out the method
ES2158779A1 (en) * 1999-04-29 2001-09-01 Cerabrick Grupo Ceramico S A External and internal building construction ceramic consists of a ground clay and cardboard industry pulp paste residue mixture with or without sand and silica
FR2870414A1 (en) * 2004-05-17 2005-11-18 Alcatel Sa DETERMINATION BY A COMMUNICATION TERMINAL OF THE TIME OF PROPAGATION OF A REFERENCE SIGNAL FROM A COMMUNICATIONS MANAGEMENT EQUIPMENT
WO2005114873A1 (en) * 2004-05-17 2005-12-01 Alcatel Determination of the propagation time of a reference signal coming from communication management equipment by a communication terminal

Also Published As

Publication number Publication date
EP0451694A3 (en) 1992-07-08
DE4011341A1 (en) 1991-10-10

Similar Documents

Publication Publication Date Title
EP0938821B1 (en) Process and base station system for configuring an air interface between a mobile station and a base station in a time-division multiplex mobile radio telephone system for packet data transmission
DE69634889T2 (en) MOBILE RADIO COMMUNICATION ARRANGEMENT
DE2727808C3 (en) Automatic radio telephone system
DE60103848T2 (en) DEVICE AND METHOD FOR LOCATING A MOBILE STATION IN A CELLULAR CDMA SYSTEM
DE69634734T2 (en) METHOD AND DEVICE FOR PROVIDING SOLID CELLULAR FUNCTIONALITIES
DE69833609T2 (en) Method and mobile station for base station identification in a mobile station of a time-division-multiplex cellular network
EP0829176B1 (en) Mobile radiotelehpone for handover without interruption between unsynchronised base stations
DE60021241T2 (en) Localization of a Mobile Unit in a Time Division Multiple Access Wireless System
DE112011100257B4 (en) Communication device with multiple SIM and multiple standby, and method for obtaining a gain for a non-traffic-carrying card thereof
DE4400331A1 (en) Radio cell extension
DE69926297T2 (en) Method for passing between two relays of a cell of a digital cellular radio communication system by means of a common transition channel.
DE1466138B2 (en) Method for the transmission of messages between several earth stations which are connected to one another via a satellite relay station
EP1260037B1 (en) Method, mobile radiotelephone system, and station for operating a connection between two stations of the mobile radiotelephone system
EP0451694A2 (en) Time-multiplex transmission system
DE1802614A1 (en) Mobile radio telephone system divided into zones
DE2050718B2 (en) Method for communication via an earth satellite by means of time division multiplex and device for carrying out the method
DE3118018C2 (en)
EP0823797B1 (en) Mobile radio terminal with means for synchronisation of data streams
DE3424163A1 (en) RADIO TELEPHONE SYSTEM
DE3011935C2 (en) Mobile radio network with network-wide synchronization
DE2625475A1 (en) Radio communications network for mobile stations - reroutes connection via second local switching centre when mobile station leaves area of first one
DE69723712T2 (en) DUAL MODE PORTABLE TELEPHONE DEVICE
DE1954754B2 (en) Radio telephony system that works with encryption of the message signals to be transmitted
WO2001047289A2 (en) Frame synchronisation between a mobile station and a base station during handover
DE69534462T2 (en) METHOD AND DEVICE FOR AUDIODATA INTERRUPTION IN A MOBILE RADIO ARRANGEMENT WITH SATELLITES

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALCATEL N.V.

Owner name: ALCATEL SEL AKTIENGESELLSCHAFT

17P Request for examination filed

Effective date: 19921212

17Q First examination report despatched

Effective date: 19950214

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19950825